In this paper we consider the massless translation invariant Nelson model with ultraviolet cutoff. It is proven that the fiber operators have no ground state if there is no infrared cutoff.
The absence of the ground state for Coulomb systems with the critical charge
Expansion of the energy of the ground state of the Gross-Pitaevskii equation in the Thomas-Fermi limit
Four-body problem in d-dimensional space: ground state, (quasi)-exact-solvability. IV
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